The U.S. Supreme Court on Thursday blocked Alabama from proceeding with the scheduled execution of Jeffery Lee via nitrogen gas, granting an emergency stay as legal challenges to the method continue. The decision temporarily halts the state's plans while the court or lower courts consider the underlying constitutional questions.

Nitrogen hypoxia, which involves causing death through oxygen deprivation rather than lethal injection, has been used in a small number of executions in Alabama. The state has positioned the method as a more humane alternative to lethal injection, though critics and legal advocates have raised serious concerns about the process and its implementation.

Lee's attorneys had sought the emergency intervention from the Supreme Court, arguing that the nitrogen gas method as applied constitutes cruel and unusual punishment in violation of the Eighth Amendment. The justices' decision to grant the stay signals that at least some members of the court found sufficient grounds to pause the execution pending further legal review.

Alabama has faced ongoing scrutiny over its execution protocols, particularly regarding nitrogen gas, since becoming one of the first states to carry out such an execution. Civil liberties organizations and death penalty opponents have argued that witness accounts and official reports from prior nitrogen executions raised troubling questions about whether the method is as painless as authorities have claimed.

The stay does not represent a final ruling on the constitutionality of the method, but rather a temporary pause while the legal process continues. It remains unclear when, or whether, Alabama will reschedule Lee's execution.